Inductive Current Sensing Without Cable Taps or Dedicated Power
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Solution Overview
Problem
Existing current detection apparatuses are limited by the installation location of electrical connection points and require a dedicated power supply, leading to increased production compliance issues and costs.
Innovation Solution
A current detection apparatus that generates induction electrical parameters using a transformation unit, eliminating the need for electrical connections and dedicated power supplies by utilizing a switch unit to manage self-excitation and a regulator circuit to stabilize power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrical connection point is reserved on the detected cable and a dedicated power supply is configured, then the current detection apparatus can detect alternating current, but the installation location is limited and production compliance costs increase
Solution Approach 1:
The patent replaces the traditional electrical connection-based detection system with a magnetic field-based detection system. The detection probe uses magnetic coupling to sense current without electrical contact, substituting the mechanical/electrical connection system with a field-based interaction system, thereby enabling flexible installation without electrical connection points.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the detected cable and the detection apparatus. The magnetic coupling mechanism uses magnetic flux as a mediator to transfer information about the current being measured, eliminating the need for direct electrical contact while maintaining detection capability.
2Reliability
If a dedicated power supply is configured to supply power to the current detection apparatus, then the apparatus can operate reliably, but the installation location is limited by the power supply location
Solution Approach 1:
The patent merges the power supply function with the detection function by using the same magnetic coupling mechanism for both purposes. The detection probe simultaneously performs current detection and self-powering through electromagnetic induction, combining two previously separate functions into a single integrated system.
Solution Approach 2:
The detection apparatus generates its own power through electromagnetic induction from the detected cable's magnetic field. The system is self-powered by the very field it is measuring, eliminating the need for external power supply connections and making the apparatus self-sufficient.
3Ease of manufacture
If an electrical connection point is reserved on the detected cable, then current detection can be implemented, but production compliance issues and costs increase
Solution Approach 1:
The patent replaces the electrical connection point mechanism with a non-contact magnetic detection mechanism. This substitution eliminates the need for modifying the cable with electrical connection points, thereby removing the associated production compliance requirements and costs while maintaining detection functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables flexible installation and reduced costs by eliminating the need for electrical connections and power supplies, enhancing production compliance and ensuring accurate current detection.
Implementation Method 1
the first transformation unit is configured to generate a first induction electrical parameter and a second induction electrical parameter based on an actual current on the detected cable
Data Source
AI summary
A current detection apparatus includes a first transformation unit, a power supply unit, a current detection unit, and a processing unit. A detected cable passes through a hollow part of the first transformation unit. The power supply unit is connected to the first transformation unit. The current detection unit is connected to the first transformation unit. The processing unit calculates a current value on the detected cable.